This chapter analyzes the traditional, ‘Weberian’ bureaucratic powers of the international secretariats of international organizations (IOs). It argues that globalization is opening up new, post-Weberian power bases for secretariats and IOs at large which were not envisaged in Weber's time. These new power bases include emerging global networks of cooperation between secretariats and other actors involved in global governance, which further reinforce the bureaucratic powers of secretariats by enabling them to exchange expertise and specialized information, best practices, and lessons learned in a flexible and swift manner. The chapter draws upon an in-depth case study of the Organisation of Islamic Cooperation (OIC) Secretariat to illustrate the way in which secretariats exert the aforementioned Weberian and post-Weberian powers in practice.